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    Volume 49, Issue 6 (April 2021)

    Migration and Reaction of Sulfate Ions in Concrete under Stray Current

    (Received 7 May 2020; accepted 2 February 2021)

    Published Online: 30 April 2021

    CODEN: JTEVAB

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    Abstract

    The article presents a study on the influence of stray current on the migration and reaction of sulfate ions in concrete. The amount of sulfate ions in concrete is determined using the barium sulfate weighing method. The thickness of the deterioration damage layer of concrete is studied using an ultrasonic flat measurement method, and the thickness prediction model of the concrete deterioration damage layer is established to consider the influence of the intensity of the stray current. The results indicate the following: (1) the greater the stray current is, the more obvious the effect; (2) the influence of the current intensity on the migration of sulfate ions in concrete is 1.55–2.57 times that of the control group without stray current; (3) under stray current, the ratio of the reaction amount of sulfate ions in the concrete to the total amount of sulfate ions is suppressed, whereas the ratio of the reacted sulfate ions to the total amount of sulfate ions increases from 58.8 to 74.5 % with an increase in the current intensity; finally, (4) under stray current and sulfate, the thickness of the concrete damage layer increases with an increase in the deterioration age and the current intensity. The influence coefficients of stray current on the sulfate ion migration and on the sulfate ion reaction are proposed, and the evolution equation of the amount of sulfate ions in the concrete under the action of stray current with the deterioration age is obtained.

    Author Information:

    Zhang, Lu
    Department of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an, Shaanxi Province

    Niu, Ditao
    State Key Laboratory of Green Building in Western China, Department of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an, Shaanxi Province

    Wen, Bo
    State Key Laboratory of Green Building in Western China, Department of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an, Shaanxi Province

    Peng, Gang
    Department of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an, Shaanxi Province

    Zhang, Yongli
    Department of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an, Shaanxi Province


    Stock #: JTE20200294

    ISSN:0090-3973

    DOI: 10.1520/JTE20200294

    Author
    Title Migration and Reaction of Sulfate Ions in Concrete under Stray Current
    Symposium ,
    Committee A01